PC97338VLJ datasheet(121/221 Pages) NSC

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Result Phase

Upon terminating the execution phase of the WRITE

DATA command, the controller asserts IRQ6, indicat-

ing the beginning of the result phase. The micropro-

cessor must then read the result bytes from the FIFO.

The values that are read back in the result bytes are

shown in Table 52 on page 108. If an error occurs, the

result bytes indicate the sector read when the error

occurred.

3.6.25 The WRITE DELETED DATA

Command

he WRITE DELETED DATA command receives data

from the host and writes logical sectors containing a

deleted data Address Mark (AM) to the selected drive.

This command is identical to the WRITE DATA com-

mand, except that a deleted data AM, instead of a

normal data AM, is written to the data field.

Command Phase

See the READ DATA command starting on page 105

and WRITE DATA on page 120 for a description of

these bytes.

Execution Phase

Data is transferred from the system to the controller in

DMA or non-DMA modes, and written to the disk. See

“Execution Phase” starting on page 85 for a descrip-

tion of these data transfer modes.

Result Phase

Upon terminating the execution phase of the WRITE

DATA command, the controller asserts IRQ6, indicat-

ing the beginning of the result phase. The micropro-

cessor must then read the result bytes from the FIFO.

The values that are read back in the result bytes are

shown in Table 52 on page 108. If an error occurs, the

result bytes indicate the sector read when the error

occurred.

3.7

EXAMPLE OF A FOUR-DRIVE

CIRCUIT USING THE

PC87338/PC97338

Figure 59 shows one implementation of a four-drive

circuit. Refer to Table 36 on page 77 to see how to en-

code the drive and motor bits for this configuration.

7654

3210

Result Phase Status Register 0 (ST0)

Result Phase Status Register 1 (ST1)

Result Phase Status Register 2 (ST2)

Track Number

Head Number

Sector Number

Bytes-Per-Sector Code

7654

3210

MFM

1001

IPS

DS1

DS0

Track Number

Head Number

Sector Number

Bytes-Per-Sector Code

End of Track (EOT) Sector Number

Bytes Between Sectors - Gap 3

Data Length (Obsolete)

7654

3210

Result Phase Status Register 0 (ST0)

Result Phase Status Register 1 (ST1)

Result Phase Status Register 2 (ST2)

Track Number

Head Number

Sector Number

Bytes-Per-Sector Code

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